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Pentax smc D FA 100 mm f/2.8 Macro WR

18 March 2011
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Arkadiusz Olech

8. Vignetting

As the Pentax 2.8/100 WR was designed for full frame, on the APS-C sensor it won’t reveal the whole truth about its vignetting. Small dimensions of the lens might suggest some problems though. The measurements, taken on the Pentax K-5, don’t confirm these suspicions at all.

Pentax smc D FA 100 mm f/2.8 Macro WR - Vignetting


At the maximum relative aperture the brightness loss in the frame corners amounts to just 16% (-0.49 EV). Vignetting becomes completely imperceptible by f/4.0 and f/5.6, where it is 7% and 3% respectively. What’s interesting, the Canon 2.8/100L, which is physically much bigger, on a bit smaller sensor of the Canon 50D camera showed higher level of vignetting. At the maximum relative aperture it was 20%. The result of the Pentax, compared to that, becomes even more impressive. A round of applause!


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Pentax smc D FA 100 mm f/2.8 Macro WR - Vignetting



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